The issue is less if citizenship was maintained, and more if E.2.2. has any circumstance explicitly provided for by law which would allow Libertanny to keep their position as an Arbiter without renomination.
Section E, 2.2 of the Conk specifies:
Citizens who leave the Region shall also surrender all governmental roles, except in circumstances explicitly provided for by law.
So while citizenship was maintained, unless the Conclave returns a different interpretation of the law as a result of the JR request I put up (namely that either CTEing does not constitute leaving the region, or that maintenance of citizenship does have a material impact on the term “leave the Region”), Libertanny surrendered their position as an Arbiter by CTEing – rectifying this would require a renomination from the Delegate rather than a reconfirmation from the Magisterium.
I agree with previous thoughts in this thread that at this point it’s a distinction without a real difference, but I also think that the prescribed process should be followed.